geoip.rs

geoip.rs is a free geoip service: it provides geographical information about ip addresses.
You can use the online version, or you can download it and host it on your infrastructure.
Source code is available on Github and licensed under the Apache License, Version 2.0

Examples

Calling ip address:

Specified ip address:

Specified ip address with JSONP:

Specified ip address with JSONP in Japanese:

Speed

While geoip.rs is able to serve about 30K requests per second, the virtual machine that hosts it is a small one, so don't expect such numbers. Consider running it on your infrastructure.